Small blocks original OE filter setup was a can with a large bolt through the center holding it in place. When the spin on filters started being manufactured and engines were equipped that way.
The " melling " filter adapter shown is what the factory equipment new eng with. For older cannisters filters you went the parts counter and purchased this new spin on filter adapter in a blue and white " AC Filter " box with spin adapter, gasket seal, hardware. I converted a few.
" Transdapt " used to be a big company with a huge selection of adapters for external coolers, remote filters, dual remote filters, and so on.
Your using -6 line ? The oil cooler uses -8 , the oil cooler wants to move volume not pressure, that's why it's 1/2 line.
The context, or the idea, of your question makes all the difference. " I maintain a fleet of K2500 for construction" versus " I'm building an over the top show truck with AN hose and such".
It can make for a response that better fits your conditions.
Good luck!